cc: Making BeginFrameSources support multiple BeginFrameObservers.

cc/scheduler/scheduler.h

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_SCHEDULER_SCHEDULER_H_
 #define CC_SCHEDULER_SCHEDULER_H_
 
 #include <deque>
 #include <string>
 
@@ skipping 139 matching lines @@
   }
 
   base::TimeTicks AnticipatedDrawTime() const;
 
   void NotifyBeginMainFrameStarted();
 
   base::TimeTicks LastBeginImplFrameTime();
 
   void SetDeferCommits(bool defer_commits);
 
-  scoped_refptr<base::trace_event::ConvertableToTraceFormat> AsValue() const;
-  void AsValueInto(base::trace_event::TracedValue* value) const override;
+  scoped_refptr<base::trace_event::ConvertableToTraceFormat> AsValue();
+  void AsValueInto(base::trace_event::TracedValue* value) override;
 
   void SetContinuousPainting(bool continuous_painting) {
     state_machine_.SetContinuousPainting(continuous_painting);
   }
 
   void SetChildrenNeedBeginFrames(bool children_need_begin_frames);
 
  protected:
   Scheduler(SchedulerClient* client,
             const SchedulerSettings& scheduler_settings,
@@ skipping 45 matching lines @@
   SchedulerStateMachine::Action inside_action_;
 
  private:
   void ScheduleBeginImplFrameDeadline();
   void RescheduleBeginImplFrameDeadlineIfNeeded();
   void SetupNextBeginFrameIfNeeded();
   void PostBeginRetroFrameIfNeeded();
   void SetupPollingMechanisms();
   void DrawAndSwapIfPossible();
   void ProcessScheduledActions();
-  bool CanCommitAndActivateBeforeDeadline() const;
+  bool CanCommitAndActivateBeforeDeadline();
   void AdvanceCommitStateIfPossible();
   bool IsBeginMainFrameSentOrStarted() const;
   void BeginRetroFrame();
   void BeginImplFrame(const BeginFrameArgs& args);
   void OnBeginImplFrameDeadline();
   void PollForAnticipatedDrawTriggers();
   void PollToAdvanceCommitState();
   void UpdateActiveFrameSource();
 
   base::TimeDelta EstimatedParentDrawTime() {
     return estimated_parent_draw_time_;
   }
 
   bool IsInsideAction(SchedulerStateMachine::Action action) {
     return inside_action_ == action;
   }
 
   base::WeakPtrFactory<Scheduler> weak_factory_;
 
   friend class SchedulerFrameSourcesConstructor;
   friend class TestSchedulerFrameSourcesConstructor;
 
   DISALLOW_COPY_AND_ASSIGN(Scheduler);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_SCHEDULER_H_